Bio-chemical oxygen demand ?

English

Gujarati

Hindi

Environmental Study

easy

What is Bio-chemical oxygen demand ?

Option A

Option B

Option C

Option D

Solution

The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water, is called Biochemical Oxygen Demand ($BOD$).

Standard 11

Chemistry

Explain the damage of troposphere by $CO$ and $CO_2$.

hard

Mention the types of atmospheric pollution.

easy

What do you mean by green chemistry? How will it help decrease environmental pollution?

medium

Given below are two statements :

Statement $I$ : If $BOD$ is $4\,ppm$ and dissolved oxygen is $8\,ppm$, then it is a good quality water.

Statement $II$ : If the concentration of zinc and nitrate salts are $5 ppm$ each, then it can be a good quality water.

In the light of the above statements, choose the most appropriate answer from the options given below :

hard

(JEE MAIN-2023)

Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?